Variable Interest Entities - Summary of Assets and Liabilities of Consolidated VIE (Detail) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021	Dec. 31, 2020
Assets:
Loans receivable	$ 23,708,990	$ 22,003,017
Current expected credit loss reserve	(122,221)	(124,679)	$ (172,100)	$ (173,549)
Loans receivable, net	23,586,769	21,878,338
Other assets	172,647	273,797
Assets	24,068,841	22,703,289
Liabilities:
Securitized debt obligations, net	2,839,818	2,838,062
Other liabilities	190,312	231,358
Liabilities	19,399,004	18,084,578
VIE
Assets:
Loans receivable	3,477,340	3,486,750
Current expected credit loss reserve	(4,441)	(4,502)
Loans receivable, net	3,472,899	3,482,248
Other assets	30,558	20,746
Assets	3,503,457	3,502,994
Liabilities:
Securitized debt obligations, net	2,839,818	2,838,062
Other liabilities	2,138	1,800
Liabilities	$ 2,841,956	$ 2,839,862